F. Herrmann

activity

20092020

most citedThe Spin-dependent Structure Function of the Proton g_1^p and a Test of the Bjorken Sum Rule

174 citations · 2.8k across the 57 of their papers we have counts for

collaborators

57 papers

hep-ex2020★ 12 cited

Spin Density Matrix Elements in Exclusive $ω$ Meson Muoproduction $^{*}$

M. G. Alexeev, G. D. Alexeev, A. Amoroso +197

We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $ω$ meson muoproduction on the proton at COMPASS using 160 GeV/ $c$ polarised $μ^{+}$ and $ μ^{…

physics.ins-det2020★ 3 cited

MPGD-based photon detectors for the upgrade of COMPASS RICH-1 and beyond

J. Agarwala, M. Alexeev, C. D. R. Azevedo +28

COMPASS is a fixed target experiment at CERN SPS aimed to study hadron structure and spectroscopy. Hadron identification in the momentum range between $3$ and $55 G e V / c$ is provide…

hep-ph2020★ 36 cited

Triangle Singularity as the Origin of the $a_{1} (1420)$

G. D. Alexeev, M. G. Alexeev, A. Amoroso +194

The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_{1} (1420)$ , decaying to $f_{0} (980) π$ . With a mass too close…

hep-ex2019★ 9 cited

Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

J. Agarwala, M. G. Alexeev, G. D. Alexeev +203

Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentu…

physics.ins-det2019

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1

J. Agarwala, M. Alexeev, C. D. R. Azevedo +25

After pioneering gaseous detectors of single photon for RICH applications using CsI solid state photocathodes in MWPCs within the RD26 collaboration and by the constructions for th…

hep-ex2019★ 24 cited

Measurement of the cross section for hard exclusive $π^{0}$ leptoproduction

M. G. Alexeev, G. D. Alexeev, A. Amoroso +199

We report on a measurement of hard exclusive $π^{0}$ muoproduction on the proton by COMPASS using 160 GeV/ $c$ polarised $μ^{+}$ and $μ^{-}$ beams of the CERN SPS impinging on a liquid hy…

hep-ex2018★ 22 cited

Measurement of $P_{T}$ -weighted Sivers asymmetries in leptoproduction of hadrons

M. G. Alexeev, G. D. Alexeev, A. Amoroso +209

The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_{T}$ , allow for the extraction of importan…

hep-ex2018★ 42 cited

Letter of Intent: A New QCD facility at the M2 beam line of the CERN SPS (COMPASS++/AMBER)

B. Adams, C. A. Aidala, R. Akhunzyanov +263

A New QCD facility at the M2 beam line of the CERN SPS COMPASS++/AMBER

physics.ins-det2018★ 23 cited

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1 and beyond

J. Agarwala, M. Alexeev, C. D. R. Azevedo +25

After pioneering gaseous detectors of single photon for RICH applications using CsI solid state photocathodes in MWPCs within the RD26 collaboration and by the constructions for th…

hep-ex2018★ 76 cited

Light isovector resonances in $π^{-} p \to π^{-} π^{-} π^{+} p$ at 190 GeV/ $c$

M. Aghasyan, M. G. Alexeev, G. D. Alexeev +221

We have performed the most comprehensive resonance-model fit of $π^{-} π^{-} π^{+}$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of…

hep-ex2018★ 47 cited

Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering

R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev +223

We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/ $c$ polarized $μ^{+}$ and $μ^{-}$ beams of the CERN SPS impinging on…

hep-ex2018★ 15 cited

K $^{-}$ over K $^{+}$ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev +207

The K $^{-}$ over K $^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The d…

hep-ex2018

First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process

Bakur Parsamyan

The COMPASS experiment at CERN, as part of its programme addresses the exploration of the transverse spin structure of the nucleon by measuring spin (in)dependent azimuthal asymmet…

physics.ins-det2017★ 1 cited

Status of COMPASS RICH-1 Upgrade with MPGD-based Photon Detectors

M. Alexeev, R Birsa, F. Bradamante +31

A Set of new MPGD-based Photon Detectors is being built for the upgrade of COMPASS RICH-1. The detectors cover a total active area of 1.4 m $^{2}$ and are based on a hybrid architectu…

hep-ex2017★ 28 cited

Longitudinal double-spin asymmetry $A_{1}^{p}$ and spin-dependent structure function $g_{1}^{p}$ of the proton at small values of $x$ and $Q^{2}$

M. Aghasyan, R. Akhunzyanov, M. G. Alexeev +225

We present a precise measurement of the proton longitudinal double-spin asymmetry $A_{1}^{p}$ and the proton spin-dependent structure function $g_{1}^{p}$ at photon virtualitie…

hep-ex2017★ 60 cited

Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering

M. Aghasyan, R. Akhunzyanov, M. G. Alexeev +227

A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaborat…

hep-ph2017★ 18 cited

New analysis of $η π$ tensor resonances measured at the COMPASS experiment

A. Jackura, C. Fernandez-Ramirez, M. Mikhasenko +232

We present a new amplitude analysis of the $η π$ $D$ -wave in $π^{-} p \to η π^{-} p$ measured by COMPASS. Employing an analytical model based on the principles of the relativistic $S$ -mat…

hep-ex2017★ 32 cited

Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $X (3872)$

M. Aghasyan, R. Akhunzyanov, M. G. Alexeev +224

We have searched for exclusive production of exotic charmonia in the reaction $μ^{+} N \to μ^{+} (J / ψ π^{+} π^{-}) π^{\pm} N^{'}$ using COMPASS data collected with incoming muons of…

hep-ex2017★ 122 cited

First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process

Aghasyan, R. Akhunzyanov, M. G. Alexeev +216

The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/ $c$ , $π^{-}$ beam and a…

hep-ex2017★ 34 cited

First measurement of the Sivers asymmetry for gluons from SIDIS data

C. Adolph, M. Aghasyan, R. Akhunzyanov +223

The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal…

hep-ex2016★ 53 cited

Final COMPASS results on the deuteron spin-dependent structure function $g_{1}^{d}$ and the Bjorken sum rule

C. Adolph, M. Aghasyan, R. Akhunzyanov +223

Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^{6}$ LiD target. The data were t…

hep-ex2016★ 55 cited

Sivers asymmetry extracted in SIDIS at the hard scale of the Drell-Yan process at COMPASS

C. Adolph, M. Aghasyan, R. Akhunzyanov +223

Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions…

hep-ex2016★ 20 cited

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

C. Adolph, M. Aghasyan, R. Akhunzyanov +221

Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined…

hep-ex2016★ 47 cited

Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

C. Adolph, J. Agarwala, M. Aghasyan +223

Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable…

Spin Density Matrix Elements in Exclusive ω Meson Muoproduction ∗

MPGD-based photon detectors for the upgrade of COMPASS RICH-1 and beyond

Triangle Singularity as the Origin of the a1​(1420)

Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1

Measurement of the cross section for hard exclusive π0 leptoproduction

Measurement of PT​-weighted Sivers asymmetries in leptoproduction of hadrons

Letter of Intent: A New QCD facility at the M2 beam line of the CERN SPS (COMPASS++/AMBER)

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1 and beyond

Light isovector resonances in π−p→π−π−π+p at 190 GeV/c

Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering

K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process

Status of COMPASS RICH-1 Upgrade with MPGD-based Photon Detectors

Longitudinal double-spin asymmetry A1p​ and spin-dependent structure function g1p​ of the proton at small values of x and Q2

Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering

New analysis of ηπ tensor resonances measured at the COMPASS experiment

Search for muoproduction of X(3872) at COMPASS and indication of a new state X(3872)

First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process

First measurement of the Sivers asymmetry for gluons from SIDIS data

Final COMPASS results on the deuteron spin-dependent structure function g1d​ and the Bjorken sum rule

Sivers asymmetry extracted in SIDIS at the hard scale of the Drell-Yan process at COMPASS

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

Spin Density Matrix Elements in Exclusive $ω$ Meson Muoproduction $^{*}$

Triangle Singularity as the Origin of the $a_{1} (1420)$

Measurement of the cross section for hard exclusive $π^{0}$ leptoproduction

Measurement of $P_{T}$ -weighted Sivers asymmetries in leptoproduction of hadrons

Light isovector resonances in $π^{-} p \to π^{-} π^{-} π^{+} p$ at 190 GeV/ $c$

K $^{-}$ over K $^{+}$ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

Longitudinal double-spin asymmetry $A_{1}^{p}$ and spin-dependent structure function $g_{1}^{p}$ of the proton at small values of $x$ and $Q^{2}$

New analysis of $η π$ tensor resonances measured at the COMPASS experiment

Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $X (3872)$

Final COMPASS results on the deuteron spin-dependent structure function $g_{1}^{d}$ and the Bjorken sum rule